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always take some time to establish NTP synchronization. The delay occurs because an NTP client normally synchronizes only every 16 seconds, and it may fail to establish correct synchronization the first time it tries. Normally, however, it should take no longer than a cup of coffee to establish NTP time synchronization. Another tool to tune the working of NTP is the ntpq command, which offers its own interactive interface from which the status of any NTP service can be requested. As when using the FTP client, you can use a couple of commands to do remote control on the NTP server. In this interface, you can use the help command to see a list of available commands. As an alternative, you can run ntpq with some command-line options. For example, the ntpq -p command gives an overview of current synchronization status. Listing 9-14 provides an example of the result, in which several parameters are displayed: remote: The name of the other server refid: The IP address of the server you are synchronizing with st: The stratum used by the other server. t: The type of clock used on the other server (L stands for local clock; u for an Internet clock) when: The number of seconds since the last poll poll: The number of seconds used between two polls reach: The number of times the other server has been contacted successfully delay: Indicates the time between an NTP request and the answer offset: The difference in seconds between the time on your local computer and that on the NTP server jitter: The error rate in your local clock, expressed in seconds

Because we have just been talking about Nulls and duplicate values, it is worth briefly mentioning here how these will affect our counts. Rather than use * as a parameter to the COUNT function so that it counts all the rows, we can put an attribute such as Handicap in parentheses, as shown in Listing 2-26. This will count the number of records that have a value for the Handicap attribute.

Many additional applications might prove useful on a day-to-day basis. Here we review some of the more common ones.

The GNOME Calculator (also known as Gcalctool) can be found on the Applications Accessories menu. In its default mode, shown in Figure 11-11, it shouldn t present any challenges to anyone who has ever used a real-life calculator.

Listing 9-14. Use the ntpq -p Command to Slow the Current Synchronization Status on Your Server. root@RNA:~# ntpq -p remote refid st t when poll reach delay offset ====================================================================== fiordland.ubunt 192.36.133.17 2 u 10 64 1 2.247 -357489 jitter 0.002

Figure 11-11. GNOME Calculator Calculator also has other modes that you can switch into by using the View menu. Perhaps the three most useful modes for general use are Advanced, Financial, and Scientific. All offer calculator functions relevant to their settings. The Advanced mode is simply a more complicated version of the basic Calculator. It can store numbers in several memory locations, for example, and can also carry out lesscommon calculations, such as square roots and reciprocals.

Listing 2-26. Retrieving the Number of Records with a Non-Null Value for Handicap SELECT COUNT(Handicap) FROM Member

Archive Manager (also known as File Roller), shown in Figure 11-12, is Ubuntu s archive tool. It s the default program that opens whenever you double-click .zip files (or .tar, .gz, or .bzip2 files, which are the native archive file formats under Linux). To extract files from an archive, select them (hold down the Ctrl key to select more than one file) and then click the Extract button on the toolbar. To create an archive on the fly, select files or folders in a Nautilus file browser window, right-click the selection, and select Create Archive. Give the archive a name, and the archive will be created. To add new files to an existing archive, double-click an archive file and then drag and drop files into the Archive Manager window. When you ve finished, simply close the Archive Manager window.

I have explained the basic NTP time configuration so far, but you can also conduct some finetuning. First are the files that are created automatically by the NTP daemon, and then there are some security settings that you can use in ntp.conf to limit what servers are allowed to get time from your server. In this section, you ll read about the NTP drift file, the NTP log file, and NTP security.

You can use the Dictionary tool to look up the definitions of words in the Collaborative International Dictionary of English. This dictionary is based on a 1913 edition of Webster s Revised Unabridged Dictionary, but with some additional modern definitions. The Dictionary tool is useful for quick lookups, although if you want a precise and modern definition of a word, you might consider using a more contemporary source. You ll find the Dictionary program on the Applications Office menu. Type the word in the Look Up text box at the top of the window, and its definition will appear in the area below, as shown in Figure 11-13. As soon as you start typing, the program will begin to look up the word in the dictionary, and this can cause a momentary delay before the letters appear on your screen.